<template>
  <div>
    <h3 text-center m-0 mb-20px>{{ t("login.login") }}</h3>
    <el-form
      ref="loginFormRef"
      :model="loginFormData"
      :rules="loginRules"
      size="large"
      :validate-on-rule-change="false"
    >
      <!-- 用户名 -->
      <el-form-item prop="username">
        <el-input v-model.trim="loginFormData.username" :placeholder="t('login.username')">
          <template #prefix>
            <el-icon><User /></el-icon>
          </template>
        </el-input>
      </el-form-item>

      <!-- 密码 -->
      <el-tooltip :visible="isCapsLock" :content="t('login.capsLock')" placement="right">
        <el-form-item prop="password">
          <el-input
            v-model.trim="loginFormData.password"
            :placeholder="t('login.password')"
            type="password"
            show-password
            @keyup="checkCapsLock"
            @keyup.enter="handleLoginSubmit"
          >
            <template #prefix>
              <el-icon><Lock /></el-icon>
            </template>
          </el-input>
        </el-form-item>
      </el-tooltip>

      <!-- 验证码 -->
      <el-form-item prop="captchaCode">
        <div flex>
          <el-input
            v-model.trim="loginFormData.captchaCode"
            :placeholder="t('login.captchaCode')"
            @keyup.enter="handleLoginSubmit"
          >
            <template #prefix>
              <div class="i-svg:captcha" />
            </template>
          </el-input>
          <div cursor-pointer h="[40px]" w="[120px]" flex-center ml-10px @click="getCaptcha">
            <el-icon v-if="codeLoading" class="is-loading"><Loading /></el-icon>

            <img
              v-else
              object-cover
              border-rd-4px
              p-1px
              shadow="[0_0_0_1px_var(--el-border-color)_inset]"
              :src="captchaBase64"
              alt="code"
            />
          </div>
        </div>
      </el-form-item>

      <div class="flex-x-between w-full">
        <el-checkbox v-model="loginFormData.rememberMe">{{ t("login.rememberMe") }}</el-checkbox>
        <el-link type="primary" underline="never" @click="toOtherForm('resetPwd')">
          {{ t("login.forgetPassword") }}
        </el-link>
      </div>

      <!-- 登录按钮 -->
      <el-form-item>
        <el-button :loading="loading" type="primary" class="w-full" @click="handleLoginSubmit">
          {{ t("login.login") }}
        </el-button>
      </el-form-item>
    </el-form>

    <div flex-center gap-10px>
      <el-text size="default">{{ t("login.noAccount") }}</el-text>
      <el-link type="primary" underline="never" @click="toOtherForm('register')">
        {{ t("login.reg") }}
      </el-link>
    </div>

    <!-- 第三方登录 -->
    <el-divider>
      <el-text size="small">{{ t("login.otherLoginMethods") }}</el-text>
    </el-divider>
    <div class="flex-center gap-x-5 w-full text-[var(--el-text-color-secondary)]">
      <CommonWrapper>
        <div text-20px class="i-svg:wechat" />
      </CommonWrapper>
      <CommonWrapper>
        <div text-20px cursor-pointer class="i-svg:qq" />
      </CommonWrapper>
      <CommonWrapper>
        <div text-20px cursor-pointer class="i-svg:github" />
      </CommonWrapper>
      <CommonWrapper>
        <div text-20px cursor-pointer class="i-svg:gitee" />
      </CommonWrapper>
    </div>
  </div>
</template>
<script setup lang="ts">
import type { FormInstance } from "element-plus";
import { LocationQuery, RouteLocationRaw, useRoute } from "vue-router";
import { useI18n } from "vue-i18n";
import AuthAPI, { type LoginFormData } from "@/api/auth.api";
import router from "@/router";
import { useUserStore } from "@/store";
import CommonWrapper from "@/components/CommonWrapper/index.vue";

const { t } = useI18n();
const userStore = useUserStore();
const route = useRoute();

onMounted(() => getCaptcha());

const loginFormRef = ref<FormInstance>();
const loading = ref(false); // 按钮 loading 状态
const isCapsLock = ref(false); // 是否大写锁定
const captchaBase64 = ref(); // 验证码图片Base64字符串

const loginFormData = ref<LoginFormData>({
  username: "admin",
  password: "123456",
  captchaKey: "",
  captchaCode: "",
  rememberMe: false,
});

const loginRules = computed(() => {
  return {
    username: [
      {
        required: true,
        trigger: "blur",
        message: t("login.message.username.required"),
      },
    ],
    password: [
      {
        required: true,
        trigger: "blur",
        message: t("login.message.password.required"),
      },
      {
        min: 6,
        message: t("login.message.password.min"),
        trigger: "blur",
      },
    ],
    captchaCode: [
      {
        required: true,
        trigger: "blur",
        message: t("login.message.captchaCode.required"),
      },
    ],
  };
});

// 获取验证码
const codeLoading = ref(false);
function getCaptcha() {
  codeLoading.value = true;
  AuthAPI.getCaptcha()
    .then((data) => {
      loginFormData.value.captchaKey = data.captchaKey;
      captchaBase64.value = data.captchaBase64;
    })
    .finally(() => (codeLoading.value = false));
}

// 登录提交处理
async function handleLoginSubmit() {
  try {
    // 1. 表单验证
    const valid = await loginFormRef.value?.validate();
    if (!valid) return;

    loading.value = true;

    // 2. 执行登录
    await userStore.login(loginFormData.value);

    // 3. 获取用户信息
    await userStore.getUserInfo();

    // 4. 解析并跳转目标地址
    const redirect = resolveRedirectTarget(route.query);
    await router.push(redirect);

    // TODO 5. 判断用户是否点击了记住我？采用明文保存或使用jsencrypt库？
  } catch (error) {
    // 5. 统一错误处理
    getCaptcha(); // 刷新验证码
    console.error("登录失败:", error);
  } finally {
    loading.value = false;
  }
}

/**
 * 解析重定向目标
 * @param query 路由查询参数
 * @returns 标准化后的路由地址对象
 */
function resolveRedirectTarget(query: LocationQuery): RouteLocationRaw {
  // 默认跳转路径
  const defaultPath = "/";

  // 获取原始重定向路径
  const rawRedirect = (query.redirect as string) || defaultPath;

  try {
    // 6. 使用Vue Router解析路径
    const resolved = router.resolve(rawRedirect);
    return {
      path: resolved.path,
      query: resolved.query,
    };
  } catch {
    // 7. 异常处理：返回安全路径
    return { path: defaultPath };
  }
}

// 检查输入大小写
function checkCapsLock(event: KeyboardEvent) {
  // 防止浏览器密码自动填充时报错
  if (event instanceof KeyboardEvent) {
    isCapsLock.value = event.getModifierState("CapsLock");
  }
}

const emit = defineEmits(["update:modelValue"]);
function toOtherForm(type: "register" | "resetPwd") {
  emit("update:modelValue", type);
}
</script>
